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<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="vehicle">
<xs:complexType>
<xs:attribute name="plateNumber" type="xs:integer"/>
<xs:attribute name="state" type="twoLetterCode"/>
</xs:complexType>
</xs:element>
<xs:element name="state">
<xs:complexType>
<xs:sequence>
<xs:element name="code" type="twoLetterCode"/>
<xs:element ref="vehicle" maxOccurs="unbounded"/>
<xs:element ref="person" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:key name="reg"> <!-- vehicles are keyed by their plate within states -->
<xs:selector xpath=".//vehicle"/>
<xs:field xpath="@plateNumber"/>
</xs:key>
</xs:element>
<xs:element name="root">
<xs:complexType>
<xs:sequence>
<xs:element ref="state" maxOccurs="51"/>
</xs:sequence>
</xs:complexType>
<xs:key name="state"> <!-- states are keyed by their code -->
<xs:selector xpath=".//state"/>
<xs:field xpath="code"/>
</xs:key>
<xs:keyref name="vehicleState" refer="state">
<!-- every vehicle refers to its state -->
<xs:selector xpath=".//vehicle"/>
<xs:field xpath="@state"/>
</xs:keyref>
<xs:key name="regKey"> <!-- vehicles are keyed by a pair of state and plate -->
<xs:selector xpath=".//vehicle"/>
<xs:field xpath="@state"/>
<xs:field xpath="@plateNumber"/>
</xs:key>
<xs:keyref name="carRef" refer="regKey"> <!-- people's cars are a reference -->
<xs:selector xpath=".//car"/>
<xs:field xpath="@regState"/>
<xs:field xpath="@regPlate"/>
</xs:keyref>
</xs:element>
<xs:element name="person">
<xs:complexType>
<xs:sequence>
<xs:element name="car" maxOccurs="2">
<xs:complexType>
<xs:attribute name="regState" type="twoLetterCode"/>
<xs:attribute name="regPlate" type="xs:integer"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:simpleType name="twoLetterCode">
<xs:restriction base="xs:string">
<xs:maxLength value="2"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="threeLetterCode">
<xs:restriction base="xs:string">
<xs:maxLength value="3"/>
</xs:restriction>
</xs:simpleType>
</xs:schema>
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